nat-api

Fast port mapping with UPnP and NAT-PMP in NodeJS.

Install

Required: NodeJS >= 10

npm install @silentbot1/nat-api

Usage

const NatAPI = require('nat-api')

// For NAT-PMP + NAT-UPNP, use:
const client = new NatAPI({ enablePMP: true, enableUPNP: true })

// Note: upnpPermanentFallback is disabled by default, meaning leases on routers which only support UPnP permanent leases will fail, this includes RouterOS/Mikrotik, Netgear, and other ISP provided routers. 

// Map public port 1000 to private port 1000 with UDP and TCP
client.map(1000).then(() => {
  console.log('Port mapped!')
}).catch((err) => {
  return console.log('Error', err)
})

// Map public port 2000 to private port 3000 with UDP and TCP
client.map(2000, 3000).then(() => {
  console.log('Port mapped!')
}).catch((err) => {
  return console.log('Error', err)
})

// Map public port 4000 to private port 5000 with only UDP
client.map({ publicPort: 4000, privatePort: 5000, ttl: 1800, protocol: 'UDP' }).then(() => {
  console.log('Port mapped!')
}).catch((err) =>{
  return console.log('Error', err)
})

// Unmap port public and private port 1000 with UDP and TCP
client.unmap(1000).then(() => {
  console.log('Port unmapped!') 
}).catch((err) => {
  return console.log('Error', err)
})

// Get external IP
client.externalIp().then((ip) => {
  console.log('External IP:', ip)
}).catch((err) => {
  return console.log('Error', err)
})

// Destroy object
client.destroy().then(() => {
  console.log('Client has been destroyed!')
}).catch((err) => {
  return console.log('Error', err)
})

API

client = new NatAPI([opts])

Create a new nat-api instance.

If opts is specified, then the default options (shown below) will be overridden.

{
  ttl: 1200, // Time to live of each port mapping in seconds (default: 1200)
  autoUpdate: true, // Refresh all the port mapping to keep them from expiring (default: true)
  gateway: '192.168.1.1', // Default gateway (default: null)
  enablePMP: false, // Enable PMP (default: true)
  enableUPNP: false, // Enable UPNP (default: true)
  upnpPermanentFallback: false // Enable UPNP permanent leases fallback (default: false)
}

If gateway is not set, then nat-api will get the default gateway based on the current network interface.

client.map(port): Promise<void>

• port: Public and private ports

This method will use port for mapping the public port to the same private port.

It uses the default TTL and creates a map for UDP and TCP.

client.map(publicPort, privatePort): Promise<void>

• publicPort: Public port
• privatePort: Private port

This is another quick way of mapping publciPort to privatePort for both UDP and TCP.

client.map(opts): Promise<void>

• opts:

• publicPort: Public port
• privatePort: Private port
• protocol: Port protocol (UDP, TCP or null for both)
• ttl: Overwrite the default TTL in seconds.
• description: Description of the port mapping

client.unmap(port): Promise<void>

Unmap any port that has the public port or private port equal to port.

client.unmap(publicPort, privatePort): Promise<void>

Unmap any port that has the public port or private port equal to publicPort and privatePort, respectively.

client.unmap(opts): Promise<void>

Unmap any port that contains the parameters provided in opts.

client.externalIp(): Promise<string>

Get the external IP address.

client.destroy(): Promise<void>

Destroy the client. Unmaps all the ports open with nat-api and cleans up large data structure resources.

Additional Information

• http://miniupnp.free.fr/nat-pmp.html
• http://wikipedia.org/wiki/NAT_Port_Mapping_Protocol
• http://tools.ietf.org/html/draft-cheshire-nat-pmp-03

License

MIT. Copyright (c) Brad Marsden